Fishing tool for junk in wells



Oct. 30 1923.

D. L. GILSTRAP FISHING TOOL FOR JUNK IN WELLS Filed Nov. 7,

I I I M, w J f 8 Patented Get. 30, 13.923.

l twdlil DANIEL L. GILSTRAP, 0F BA'ISON, TEXAS.

FISHING TOOL FOR JUNK IN WELLS.

Application med November 7. 1922. Serial in. 599,494.

To all whom 2'2, may conccm:

Be it lniown that I, DANIEL L. .GILSTRAP, a citizen of the United States, residing at Batson, Hardin County, Texas, have in vented a certain new and useful Improvement'in Fishing Tools for Junk in ells, of which the following is a full, clear, and exact description, such as will enable others skilled in theart to which it appertains to make use of the same.

My invention relates to tools for fishing out and removing pieces of broken tools, rock, orother junk from wells. 7

The object of my invention is to provide a device which will scrape up and remove small or broken pieces of steel or lost tools from the well.

Another object is to provide a fishing tool which will scrape up material from the bottom of the well,-and means thereon to prevent the loss of such material. from the device when the same is being removed from the well.

Another object of theinvention is to provide eiiicient means for forcing the junk or other objects up into the device whereby it may be removed.

Other objects and advantages will be more clearly set forth in the specification which follows.

Referring to thezdrawing herewith illus trating the preferred embodiment of my invention Fig. 1 isa'c entral longitudinal section through a well casingyshowingmy tool therein, some parts of said tool-being in elevation; F ig. 2 is a similar view of the device taken at right angles to the position shown in F ignl; Fig. 3 is. a transverse section on the line 3+3 of Fig. 2; Fig. 4 is a similar section on the line 4l lof Fig. 1.;

Fig. 5 'is a similar view taken on t-he line 5-5 of Fig. 2; 6 is a broken perspective view of the lower portion of the tool, and Fig. 7 is a broken view illustrating another embodiment of the scraping device.

In the drilling of wells for oil, water, gas, etc., it frequently occurs that bolts, nuts or broken pieces of drilling tools are lost in the well and lie upon the bottom of the hole, where they seriously interfere with the progress of the drilling. Some times the cutters from a roller bit will become loosened and lost in the hole and cannot be milled to pieces insuclrway as to allow the drilling to proceed. In the use of my improved device 1 desire to introduce the tool into the bottom of the well and by rotating it to scoop up and retain such of junk so that they the drilling proceed.

In the drawing, wherein like numerals have been applied to like parts in all the views, I have illustrated my device in Fig. l as being inserted downwardly within a casing 1. The tool comprises an outer length of pipe 2 threaded at its upper end for connection by means of a nipple 3 to a drill stem 4. The lower end of the pipe is partially closed by means of a cylindrical block 5 secured firmly in place by means of set screws 6 or other similar expedients.

broken pieces maybe removed and The pipe 2 is perforated at 7 adjacent the lower end thereof to allow the passage therethrough of water which may enter the tool.

The lower block 5 at the end of the tool is provided with a sector-shaped opening 8 extending from the outer margin to a point somewhat past the center. thereof. On one side of this opening I form an inclined seat 9 for a scraping knife or blade 10. This blade, as seen particularly in Fig. 6, is formed with a scraping edge 11 at its lower end and projects slightly beyond the block 5 upon which it is mounted and has a rearwardly-extending portion 12 fitting beneath the lower edge of the block. The scraper is secured to, the block, by -means of set screws or bolts 13 extending through the blade of the scraper and attached within the block. The upper end of the blade extends slightly above the block and the upper set screw serves to hold itfirmly at that point. The scraping blade is designed to extend slightly past themiddle of the tool so that it will scrape the entire bottom of the hole as the tool is rotated in the usual right-hand direction.

Innnediately above the lower block 5 is formed a chamber 14. extending for a greater portion of the distance from the lower end to the upper end of the pipe 2 and having an upper cylindrical block 15 fitting within said pipe-2 to bound the upper end of the said chamber. The opening .8 in the lower block 5 has vertically extendingwalls at each edge thereof, bounding the quadrant of the circle, these wa ls being attached at is attached to a second bar 23 on the opposite side of the wall 22 and spaced therefrom by means ofrods or bolts 24; said bolts 24 are adapted to move in a vertical slot 25 formed in the wall 22. The'upper end of the bar 23 extends through an opening 26 in the block 15 to a predetermined point above the said block. It also passes downwardly through the lower block 5 by means of an opening 27 therein. The bar 23 is squared and fits within the squared openings 26 and 27 whereby rotation is prevented.

The upper end of the pipe 2 is fitted with a third block 28 which is secured'in place flush with the upper end by means of set screws or pins 29 passing through the pipe 2 and secured within the block.

An opening 29 is formed therein at a point adjacent one side of the center thereof to allow the passage therefrom of a pipe 30 to conduct water from the upper, drill stem 4 to the scraping point of the blade 10. It extends through the central block 15 and fits tightly in the lowerblock 5 by being secured within a recess 32 therein. The recess 32 communicates with a' laterally directed opening 34 which is curved adjacent the wall of the opening 8 so as to direct the liquid from the pipe 30 directly toward the point of the blade 10. This is shown in dotted lines in- Fig. 4:. 1

The blade shown in Figs. 1 to 6 of the drawing are intended particularly for a soft formation. In extremely hard formation it may be preferable to use a'scraping blade 35 such as is shown in Fig. 7. This blade is like the blade 10 except that the lower end extends only very slightly beneath the lower end of the tool and will therefore take only part of the downward thrust of the tool upon the bottom of the hole and act to scrape the rock somewhat more eliiciently.

In the use of my device the parts are assembled as shown in Fig. 1. The rod or bar 23 will be moved into its lower position as there shown and will extend several inches belo the lower block 5. The door 20 will be thus in closed position. Wien the tool strikes the bottom of the hole the bar 23 will be forced upwardly, thereby opening the door 20 and maintaining the same in raised position While the device is operating. A lower hooked end 37 on the bar will fit within a recess provided therefor in the bottom of;

upwardly by theblade and carried into the lower end of the chamber 14:. The blade extending slightly above the lower end of the chamber will prevent its easy removal.

The current of flushing fluid pumped downwardly through the drill stem and the pipe 30 will be projected directly against the blade and will assist in throwing these objects into the retainingchamberyWhen these objects tom, allowing the rod 23 to drop downwardly. If desired, a weight 38 maybe fixed have 'b een'scraped into the device the said r device will be raised upwardly from the botupon the upper end ofthe rod 23, thus assu'ring the dropping of the-door vice is raised from thebottom, 'lVater finding an entrance to the chamber with the ror tation of the device will be adapted to be when the de drained therefrom through the'openings 7.

WVh ile this tool is adapted simply for scraping material from the bottom of the hole, it will in certain cases perform a slight drilling function. P It" is" not intended for drilling, however, and may therefore be built fairly cheaply of lightconstruction. It

is only intended for the scraping of the bottom of the hole and will therefore accomplish itsobjeet without the necessity of the,

usual heavy construction used in drilling tools. It is obvious that it maybe used for removing samples of the formation, especiallyfwhere the formation is comparatively soft. The further objects and advantages of this device will be apparent to one skilled in r the artwithout furtherdescription.

WVhat I-claim as new and desire to protect by Letters Patent is:

1. In a-fishing tool, a tubular cylindrical housing, a closure for lower endhaving a sector shaped opening there1n,. a scraping blade onone side'of said-opening, a: chamber in said housing having walls around said opening, a slidingdoor in the wall above said bladefautomatic means to open said door actuated bycontactof the tool on the bottom of the hole, and means to close Said door when the tom.- V

2. In a fishing tool, a housing; a' closure for the lower end having an opening therein, a scraping blade at one side ofsaid opening, a receiving chamber in'said housing having walls around said opening, a vertically slid able door'in thewall above said blade, means to automatically open saiddoor when the tool is in operative position, said dooradapted to automatically close when said'tool. is raised from the bottom.

tool israised fromthe bot-' 3. In a fishing tool, a housing having closures at both ends thereof, the lower closure having a sectoral opening therein, a for wardly inclined blade on one side of said opening and a Water conducting pipe extending through said housing and closures and adapted to (:lischarge liquid directly against the forward side of said b1ade,7vvhereby material on the bottom of the hole is forced into said housing.

4. In a fishing tool, a housing having an opening therein at the lower end, means adjacent said opening to scrape up small objects from the bottom of a well hole, flushing means to assist said scraping means in gathering up said objects through said open ing and means operable when said tool is raised from the bottom to retain said objects in said housing.

5. In a fishing tool, a tubular housing, a s

lower end closed except for a sectoral-shaped opening therein, a chamber in said housing having a sliding door therein above said opening and means to open said door autoniatically when said tool is in operative position said door adapted to close when said device is raised, a pipe extending through said housing to direct water into said open ing, the walls of said housing having perforations therein to drain liquid therefrom.

In testimony whereof I hereunto aflix my signature this the 3rd day of November,

DANIEL L GILSTRAP. 

